[cairo] gtk, cairo, surfaces and alpha

[Donn]

> tsurf = ctx.get_target() #get surface from context
> tsurf.write_to_png("screen.png")
This is great. One wrinkle: Is there any way to get alpha written out to the 
PNG? I would like transparent areas in the output -- in the window they would 
show as grey (the default window colour).

\d
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